Instability after total hip arthroplasty

Figure 2 Anteroposterior pelvis radiograph of a 52-year-old female who is status post left total hip arthroplasty with subsequent revision of the femoral component for hardware loosening and instability. A: She sustained a prosthetic hip dislocation during physical therapy that was unable to be reduced by closed means. At the time of open reduction, revision total hip arthroplasty was indicated to correct the risk factors for instability; B: This included revision of the retroverted acetabular cup, revision of the malpositioned revision femoral stem, and increasing the femoral head size. The patient has not experienced any recurrent episodes of instability.